retardon Academic Vocabulary List使减速,妨碍,阻止 retard retard(verb) 使减速,妨碍,阻止 retardation retardation(noun) 妨碍,迟延,阻滞 retarded retarded(adjective) 发展迟缓的,智力迟钝的 retardant retardant(noun) 延缓(作用)剂 Forms verbnounadjective retard retardation retarded retardant